A method and system are provided for scheduling data transmission in a Multiple-Input Multiple-Output (MIMO) system. The MIMO system may comprise at least one MIMO transmitter and at least one MIMO receiver. Feedback from one or more receivers may be used by a transmitter to improve quality, capacity, and scheduling in MIMO communication systems. The method may include generating or receiving information pertaining to a MIMO channel metric and information pertaining to a Channel Quality Indicator (CQI) in respect of a transmitted signal; and sending a next transmission to a receiver using a MIMO mode selected in accordance with the information pertaining to the MIMO channel metric, and an adaptive coding and modulation selected in accordance with the information pertaining to the CQI.

Described is a technology to reduce the interference between two or more transmit receive (Tx/Rx) points (TRPs) and improve the reliability for New Radio ultra reliable low latency communication (NR URLLC) applications. The technology operates in one aspect at a network node, and in another aspect at a user equipment. If a network device decides to use packet duplication, the network device can indicate duplication to the user equipment. The network device can send duplicate copies, e.g., via two different antenna panels, or can send one copy and coordinate with another network device (e.g., another cell) to send the other copy. When the user equipment receives the copies, the user equipment combines the data, e.g., via soft combining or concatenation into combined data, and decodes the combined data. Weights, such as corresponding to channel quality from each transmit source, can be used as factors in the combining of the data.

The invention discloses a beam domain optical wireless communication method and system. A base station is equipped with an array of optical transceiver ports or transmitter/receiver ports and a lens, each optical transceiver port forms a beam with centralized energy through the lens, and the base station generates beams in different directions by using the optical transceiver port array and the lens, thereby realizing multi-beam coverage or large-scale beam coverage in a communication region. The base station transmits/receives signals of multiple or a large number of user terminals by using channel state information of each user terminal, and different optical transceiver ports transmit/receive signals in different directions, thereby realizing simultaneous communication and bidirectional communication between the base station and different user terminals.

A circular stapling instrument is provided. The circular stapling instrument includes a handle forming a cavity, a reciprocating drive shaft, a carrier cover, and a shaft assembly. The reciprocating drive shaft is detachably secured within the cavity of the handle. The carrier cover covers a portion of the reciprocating drive shaft within the cavity of the handle. The shaft assembly is detachably coupled with the handle.

The invention discloses a beam domain optical wireless communication method and system. A base station is equipped with an array of optical transceiver ports or transmitter/receiver ports and a lens, each optical transceiver port forms a beam with centralized energy through the lens, and the base station generates beams in different directions by using the optical transceiver port array and the lens, thereby realizing multi-beam coverage or large-scale beam coverage in a communication region. The base station transmits/receives signals of multiple or a large number of user terminals by using channel state information of each user terminal, and different optical transceiver ports transmit/receive signals in different directions, thereby realizing simultaneous communication and bidirectional communication between the base station and different user terminals.

Described is a technology to reduce the interference between two or more transmit receive (Tx/Rx) points (TRPs) and improve the reliability for New Radio ultra reliable low latency communication (NR URLLC) applications. The technology operates in one aspect at a network node, and in another aspect at a user equipment. If a network device decides to use packet duplication, the network device can indicate duplication to the user equipment. The network device can send duplicate copies, e.g., via two different antenna panels, or can send one copy and coordinate with another network device (e.g., another cell) to send the other copy. When the user equipment receives the copies, the user equipment combines the data, e.g., via soft combining or concatenation into combined data, and decodes the combined data. Weights, such as corresponding to channel quality from each transmit source, can be used as factors in the combining of the data.

A test transmission can be used to train and/or select a signal. For example, a cellular network can configure a receiver with a recommended receiver signal sweeping pattern for mobile devices. A transmitter device can duplicate a data packet transmission and send it to a receiver device to ensure that the receiver can receive the duplicated packets from different signals. Consequently, the duplicated data packet can be indicated in the associated control channel so that the receiver is aware that the data packet is a duplicated transmission, and based on this info and configuration data, the receiver can select a more favorable signal.

A first unmanned aerial vehicle (UAV) test cell may be positioned at a first position and a second UAV test cell may be positioned at a second position. The first position and the second position may be designated as a pair of unbroken link positions in response to a line-of-sight (LOS) wireless communication link being unblocked between the first UAV test cell and the second UAV test cell. Otherwise, the first position and the second position may be designated as a pair of broken link positions in response to the LOS wireless communication link being blocked between the first UAV test cell and the second UAV test cell.

A method and system are provided for scheduling data transmission in a Multiple-Input Multiple-Output (MIMO) system. The MIMO system may comprise at least one MIMO transmitter and at least one MIMO receiver. Feedback from one or more receivers may be used by a transmitter to improve quality, capacity, and scheduling in MIMO communication systems. The method may include generating or receiving information pertaining to a MIMO channel metric and information pertaining to a Channel Quality Indicator (CQI) in respect of a transmitted signal; and sending a next transmission to a receiver using a MIMO mode selected in accordance with the information pertaining to the MIMO channel metric, and an adaptive coding and modulation selected in accordance with the information pertaining to the CQI.

A method for X2 interface communication is disclosed, comprising: at an X2 gateway for communicating with, and coupled to, a first and a second radio access network (RAN), receiving messages from the first RAN according to a first X2 protocol and mapping the received messages to a second X2 protocol for transmission to the second RAN; maintaining state of one of the first RAN or the second RAN at the X2 gateway; executing executable code received at an interpreter at the X2 gateway as part of the received messages; altering the maintained state based on the executed executable code; and receiving and decoding an initial X2 message from the first RAN; identifying specific strings in the initial X2 message; matching the identified specific strings in a database of stored scripts; and performing a transformation on the initial X2 message, the transformation being retrieved from the database for stored scripts, the stored scripts being transformations.